Dynamic Valve Train Analysis

Static checks (engine off) are to be made on the engine prior to the dynamic procedure.

Start the engine and, while running at idle, check for proper operation of all parts. Check the following:

Rocker Arm

• Check for plugged oil feeds.

If a condition of insufficient oiling is suspected, accelerate the engine to 1200 rpm ± 100 rpm with the transmission in NEUTRAL and the engine at normal operating temperature. Oil should spurt from the rocker arm oil holes such that valve tips and rocker arm are well oiled and/or, with the valve cover (6582) off, oil splash may overshoot rocker arm (6564) . If oiling is insufficient for this condition to occur, check oil passages for blockage.

Push Rods

• Check for bent push rods (6565) and restriction in oil passage.
• Check for proper rotation of push rods (non-roller valve tappets (6500) ).

Positive Rotator and Valve Spring Retainer Keys

• Check for proper operation of positive rotator.

Valves and Cylinder Head

• Check for plugged oil drain back holes.
• Check for missing or damaged valve stem seals (6571) or guide mounted valve stem seals .

If a condition of insufficient oiling is suspected, check oil passages for blockage, then accelerate the engine to 1200 rpm with the transmission in NEUTRAL and the engine at normal operating temperature. Oil should spurt from the rocker arm oil holes such that valve tips and rocker arms are well oiled. With the valve cover off, some oil splash may overshoot rocker arm .